Senior Accounts Payable Specialist; Accounting, Finance, A​/P; Hybrid - Chesterfield, MO; St. Louis

Senior Accounts Payable Specialist (Accounting, Finance, A/P) - Hybrid - Chesterfield, MO (St. Louis) Location 1 Headquarters, Experitec, Inc. St. Louis, MO Job Code 812 # of Openings 1

Senior Accounts Payable Specialist (Accounting, Finance, A/P) – Hybrid – Chesterfield, MO (St. Louis)

Come join a company that recognizes and rewards your abilities, provides opportunities to advance your career, and fosters an environment to learn and develop. Experitec is seeking high impact employees with focus and integrity to significantly improve the businesses of our customers and shape the future of Experitec’s business. Join a high-performance team and level up your customer service acumen while sharing your knowledge with other team members.

Come join a 100% employee-owned company focused on customer outcomes and employee success! This position requires a hands‑on approach, a strong work ethic, the ambition to interface with customers onsite, a troubleshooting mindset, and a commitment to excellence.

In this position, you may have the opportunity to work in different industries including power, chemical, renewable energy, food & beverage, refining, oil & gas, pulp & paper, water treatment, metals/mining and consumer goods. Experitec provides strong technical and customer service training throughout your career which will include:

• On-The‑Job training to set you up for success.
• Training on Financial systems.
• Ongoing training on various company functions as an Employee‑Owner to broaden business acumen.

The Senior Accounts Payable Specialist is a part of our Finance Team and is responsible for managing the full‑cycle accounts payable function for Experitec. This role ensures timely and accurate processing of supplier invoices, employee expenses, supplier payments, statement reconciliations, and supplier maintenance activities.

• Serving as a subject matter expert for AP processes.
• Driving continuous improvement initiatives.
• Supporting month‑end close activities.
• Partnering with sales, purchasing, and operations teams.
• Maintaining strong financial controls and supplier relationships.

• Process high‑volume PO and non‑PO supplier invoices accurately and timely.
• Review invoices for proper approvals, coding, and supporting documentation.
• Manage AP mailbox activities and monitor invoice workflow queues.
• Process supplier credits and other vendor transactions.
• Research and resolve invoice discrepancies and supplier inquiries.
• Process new supplier setup requests and supplier maintenance changes.
• Assist with supplier credit reference requests.

• Prepare weekly payment runs, including checks, ACH, and wire transfers.
• Maintain payment schedules and ensure compliance with company cash management policies.
• Generate and distribute remittance information to suppliers.
• Resolve payment exceptions and banking issues.
• Support Positive Pay and other fraud prevention processes.

• Review and process employee expense reports.
• Ensure compliance with company travel and expense policies.
• Assist employees with expense report inquiries and training.

• Reconcile suppler statements and investigate outstanding items.
• Prepare Accounts Payable account reconciliations.
• Support month‑end and year‑end close activities.
• Monitor aged payables and identify unusual balances.
• Support external audit requests and provide Accounts Payable documentation.

• Identify opportunities for Accounts Payable workflow improvements.
• Document procedures and maintain work instructions.
• Ensure compliance with company policies and internal controls.
• Serve as a backup resource…